Thus the plasma present in the interior of the flux tube must be lighter and buoyant. In this way, the flux tube should become buoyant and rise against the gravitational field.
The solar photosphere is embedded with magnetic field
by turbulent convection motions, concentrated in the magnetic flux tubes. The buoyant flux tubes rise in the convection zone by obeying the Schwarzschild criteria given in equation REF  and expelled out in the chromosphere and imposed beautiful magnetic loop structures in the upper chromosphere and in the solar corona ([1]}). In the emerging process of flux tubes, they form: sunspots in the ARs of magnetic field strength B\(\approx \)  10\(^3\)  Gauss, coronal loops in the photospheric footpoints of strength B\(\approx \)  10\(^2\)  Gauss, and in the large coronal heights with strength B\(\approx \)  10 Gauss ([2]}).
The flow of magnetic field inside the flux tube may explain by the induction equation in basic magnetohydrodynamics (MHD) ([3]}):
\(\frac{\partial \vec{B}}{\partial t}= \vec{\nabla }\times (\vec{v} \times \vec{B}) + \eta \nabla ^2 B\) 
